September 2015
Intermediate to advanced
608 pages
21h 29m
English
Content preview from Santos:CCNA Sec 210-260 OCG
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IPv6 Access Control Lists
As with IPv4, network administrators can use access control lists (ACL) on IOS devices to filter and restrict the types of IPv6 traffic that enters the network at ingress points. The configuration in Example 12-4 prevents unauthorized IPv6 packets on UDP port 53 (DNS) from entering the network from interface Gigabit 0/0. In this example, 2001:DB8:1:60::/64 represents the IP address space that is used by DNS servers that the network administrator is trying to protect, and 2001:DB8::100:1 is the IP address of the host that is allowed to access the DNS servers.
Caution
Be careful to ensure that all required traffic for routing and administrative access is allowed in the ACL before denying all unauthorized traffic.
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